______ is surprising to us is that Tom, for ______ English was once boring, can speak English fluently as though he were a native speaker.
Most American children go to state schools, but the private schools ______ be very good.
Children should make ______ a rule to wash hands before meals.
— I have never been to the United States before. — ______! Your spoken English is amazing.
In fact, he______ in bed all the morning without doing anything, but he ______ to me about that.
Britain, as well as many other industrialized countries, ______ major changes in the past 100 years.